CN109689246A - Casting mold method - Google Patents
Casting mold method Download PDFInfo
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- CN109689246A CN109689246A CN201780054679.4A CN201780054679A CN109689246A CN 109689246 A CN109689246 A CN 109689246A CN 201780054679 A CN201780054679 A CN 201780054679A CN 109689246 A CN109689246 A CN 109689246A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
In casting mold method, the normal temperature compressed intensity abstraction process of the reacting dose calculation process of binder, the normal temperature compressed Strength co-mputation process of test body, the normal temperature compressed prediction of strength process of mold, mold with composition self-hardening property sand, in the actual mold of moulding, normal temperature compressed intensity σ ce (θ is extracted by the normal temperature compressed intensity abstraction process of the mold, t), draft is carried out after the time t1 as molding conditions parameter by meeting the normal temperature compressed intensity σ ce (θ, t).
Description
Technical field
The present invention relates to the casting mold methods for using self-hardening property sand molding mold.
Background technique
As general casting mold method, have in the frame for being provided with prototype, filling sand, binder and hardening promote
Self-hardening property sand made of agent is kneaded extracts the prototype (hereinafter referred to as " draft "), institute after self-hardening property sand hardening
The shape for stating prototype is just transferred on the self-hardening property sand of the hardening, thus the casting mold method of moulding mold.
Use above-mentioned casting mold method, it is known to prototype is used, to the male rotor and female rotor of screw compressor
The mold of complicated shape required for the casting of product such, with distorted shape carries out the casting mold method of moulding
(for example, referring to patent document 1).
By using this technology disclosed in above patent document 1, it is possible to reduce the machining allowance of casting makes casting near net
Shape.
[existing technical literature]
[patent document]
[patent document 1] Japanese Laid-Open 2015-128791 bulletin
But in the technology disclosed in above patent document 1, about the power for extracting prototype and think to influence whether mold
Intensity self-hardening property sand normal temperature compressed intensity, be only only consider be to draft from after the mixing of self-hardening property sand
Time only.
Therefore, in the actual mold of moulding, for example, if the temperature of the sand of the composition self-hardening property sand as molding conditions parameter
Degree variation, then the normal temperature compressed intensity of self-hardening property sand can change, and past draft opportunity just cannot be applicable in.
Therefore, there is such problems point, for above-mentioned draft opportunity rationalization (that is, mold does not damage
And can be with moulding, and it is capable of the draft opportunity of draft), it must be tested every time.
Summary of the invention
The object of the present invention is to provide one kind in the actual mold of moulding, even if molding conditions change,
Without being tested every time, the damage of mold can be eliminated and carry out moulding, further, it is possible to the casting mold side of draft
Method.
In order to reach this purpose, the casting mold method of first invention, which is characterized in that
It is the self-hardening property sand made of filling sand, binder and hardening accelerator are kneaded in the frame for being provided with prototype,
After self-hardening property sand hardening, extracts the prototype and carry out draft, the shape of the prototype is transferred to the hardening
On self-hardening property sand, so that the casting mold method of moulding mold, has following process:
The reacting dose calculation process of binder, wherein as Modelling strip when using the self-hardening property sand molding test body
Part parameter, using the temperature θ [DEG C] of the sand before mixing, from the self-hardening property after the mixing to prototype after curing
Time t1 [min] at the time of no longer presence among sand and it is no longer existing among the self-hardening property sand of prototype after curing when
It is calculated to the time t2 [min] before carrying out compression test for the test body based on following formula (1) and formula (2) after carving
The reacting dose Δ C (θ, ti) [wt%] (i=1,2) of the binder；
The normal temperature compressed Strength co-mputation process of test body, wherein will be via the reacting dose calculation process meter of the binder
The reacting dose Δ C (θ, t1) and Δ C (θ, t2) of calculating substitute into following formula (3), and the room temperature for calculating the test body is (said here
So-called " room temperature ", refers to atmosphere temperature when moulding) compressive strength σ c (θ, t) [MPa]；
The normal temperature compressed prediction of strength process of mold, wherein using the self-hardening property sand the molding conditions parameter it
The normal temperature compressed intensity σ ca (θ, t) of mold when lower moulding mold, using the normal temperature compressed intensitometer by the test body
The normal temperature compressed intensity σ c (θ, t) for calculating the calculated test body of process, predicts the normal temperature compressed intensity σ of the mold in advance
ca(θ,t)；
The normal temperature compressed intensity abstraction process of mold, wherein experiment is first passed through in advance, from the room temperature pressure of the mold of the prediction
Among contracting intensity σ ca (θ, t), extract the mold will not damage and can moulding, and be capable of the normal temperature compressed intensity σ of draft
Ce (θ, t),
When the actual mold of moulding, described in being extracted by satisfaction as the normal temperature compressed intensity abstraction process of the mold
Draft is carried out after the time t1 of the molding conditions parameter as described in of normal temperature compressed intensity σ ce (θ, t).
[formula 1]
Δ C (θ, ti)=Δ Csat·{1-exp(-kditi)} …(1)
Here,
ΔCsat: the saturated reaction amount [wt%] of binder
kdi(i=1,2): the rate constant [1/min] of binder
[formula 2]
kdi=Aiexp(αiθ) …(2)
Here,
Ai(i=1,2), αi(i=1,2): the parameter of the binder type used is depended on
[formula 3]
σc(θ, t)={ tanh (β Δ C (θ, t1))+γ+{ tanh (ε (θ) Δ C (θ, t2)-η)} …(3)
Here,
β, γ, η: material parameter, ε: the constant determined by temperature θ
In addition, the casting mold method of the second invention, is the casting mold method according to first invention, which is characterized in that
The normal temperature compressed intensity σ ce (θ, t) is 0.5 [MPa]≤σ ce (θ, t) [MPa]≤2.2 [MPa].
In addition, the casting mold method of third invention, is the casting mold method according to first invention or the second invention,
It is characterized in that, the temperature θ of the sand is 5~30 DEG C.
As more than, it is a feature of the present invention that
It is the self-hardening property sand made of filling sand, binder and hardening accelerator are kneaded in the frame for being provided with prototype,
After self-hardening property sand hardening, extracts the prototype and carry out draft, the shape of the prototype is transferred to the hardening
On self-hardening property sand, so that the casting mold method of moulding mold, has following process:
The reacting dose calculation process of binder, wherein as Modelling strip when using the self-hardening property sand molding test body
Part parameter, using the temperature θ [DEG C] of the sand before mixing, from the self-hardening property after the mixing to prototype after curing
Time t1 [min] at the time of no longer presence among sand and it is no longer existing among the self-hardening property sand of prototype after curing when
It is calculated to the time t2 [min] before carrying out compression test for the test body based on above formula (1) and formula (2) after carving
The reacting dose Δ C (θ, ti) [wt%] (i=1,2) of the binder；
The normal temperature compressed Strength co-mputation process of test body, wherein will be via the reacting dose calculation process meter of the binder
The reacting dose Δ C (θ, t1) and Δ C (θ, t2) of calculating substitute into above formula (3), calculate the test body normal temperature compressed intensity σ c (θ,
t)[MPa]；
The normal temperature compressed prediction of strength process of mold, wherein use the self-hardening property sand, the molding conditions parameter it
The normal temperature compressed intensity σ ca (θ, t) of mold when lower moulding mold, using the normal temperature compressed intensitometer by the test body
The normal temperature compressed intensity σ c (θ, t) for calculating the calculated test body of process, predicts the normal temperature compressed intensity σ of the mold in advance
ca(θ,t)；
The normal temperature compressed intensity abstraction process of mold, wherein experiment is first passed through in advance, from the room temperature pressure of the mold of the prediction
Among contracting intensity σ ca (θ, t), extract the mold will not damage and can be with moulding, and it is possible to the normal temperature compressed intensity of draft
σ ce (θ, t),
When the actual mold of moulding, described in being extracted by satisfaction as the normal temperature compressed intensity abstraction process of the mold
Draft is carried out after the time t1 of the molding conditions parameter as described in of normal temperature compressed intensity σ ce (θ, t).
In this way, in the present invention, there is following process: under the molding conditions parameter of moulding mold, in advance in high precision
Predict the normal temperature compressed prediction of strength process of the mold of the normal temperature compressed intensity σ ca (θ, t) of the mold in ground；Reality is first passed through in advance
Test, among the normal temperature compressed intensity σ ca (θ, t) of the mold of the prediction, extract the mold will not damage and can moulding, and
And it is capable of the normal temperature compressed intensity abstraction process of the mold of the normal temperature compressed intensity σ ce (θ, t) of draft.Therefore, in moulding reality
Mold when, even if above-mentioned molding conditions parameter changes, meet the normal temperature compressed intensity of the mold from wherein selection and mention
Take molding conditions parameter as the normal temperature compressed intensity σ ce (θ, t) extracted in process.As long as that is, by this
The composition of draft is carried out after above-mentioned time t1 in the molding conditions parameter of selection.
Thereby, it is possible to provide in the actual mold of moulding, even if molding conditions change, without every time into
Row experiment, just can eliminate the damage of mold and carry out moulding, further, it is possible to carry out the casting mold method of draft.
Detailed description of the invention
Fig. 1 is the mold for mold test body, and (a) is top view, is (b) main view.
Fig. 2 is the relationship by time t and the reactivity δ of resin indicated in draft after by t1=20min
Figure.
Fig. 3 is the figure of the relationship by time t and the reactivity δ of resin when indicating the draft after t1=35min.
Fig. 4 is the figure of the relationship by time t and the reactivity δ of resin when indicating the draft after t1=50min.
Fig. 5 is the figure for indicating the relationship of the rate constant kd1 of temperature θ and resin of sand.
Fig. 6 is the figure for indicating the relationship of the rate constant kd2 of temperature θ and resin of sand.
Fig. 7 be the reacting dose Δ C (θ, t) for indicating resin and the relationship of average normal temperature compressed intensity σ c (θ, t) figure (sand
Temperature θ=5 DEG C).
Fig. 8 be the reacting dose Δ C (θ, t) for indicating resin and the relationship of average normal temperature compressed intensity σ c (θ, t) figure (sand
Temperature θ=10 DEG C).
Fig. 9 be the reacting dose Δ C (θ, t) for indicating resin and the relationship of average normal temperature compressed intensity σ c (θ, t) figure (sand
Temperature θ=20 DEG C).
Figure 10 is the figure (sand of the reacting dose Δ C (θ, t) for indicating resin and the relationship of average normal temperature compressed intensity σ c (θ, t)
Temperature θ=30 DEG C).
Figure 11 is the signal main view sectional view for the composition for indicating casting mold device.
Figure 12 is the figure of the relationship of the normal temperature compressed intensity σ ca (θ, t) for indicating mold and the formation state of mold.
Specific embodiment
The present inventors as where moulding actual mold when, even if molding conditions change, without every time into
Row experiment, just can be realized mold do not damage and can moulding, and the casting mold method for capableing of draft has carried out with keen determination
Research.Itself as a result, it has been found that, using this composition described below, then can reach purpose for the first time.
(casting mold method of the invention)
That is, casting mold method of the invention,
For example, being filling sand, binder and hardening in the frame for being provided with wooden, resin system or metal prototype
Self-hardening property sand made of promotor is kneaded is extracted the prototype after self-hardening property sand hardening and (hereinafter referred to as " is pulled out
Mould "), the shape of the prototype is just transferred on the self-hardening property sand after the hardening, thus the casting mold method of moulding mold,
Wherein, there is following process:
The reacting dose calculation process of binder is as making when using the self-hardening property sand and the aftermentioned test body of moulding
Type conditional parameter, using the temperature θ [DEG C] of the sand before mixing, after the mixing to prototype after curing
It time t1 [min] at the time of no longer presence among self-hardening property sand and is no longer deposited among the self-hardening property sand of prototype after curing
At the time of after to for the test body carry out compression test before time t2 [min], be based on following formula (1) and formula (2),
The process for calculating the reacting dose Δ C (θ, ti) [wt%] (i=1,2) of the binder；
The normal temperature compressed Strength co-mputation process of test body is will to calculate via the reacting dose calculation process of the binder
Reacting dose Δ C (θ, t1) and Δ C (θ, t2) out substitutes into following formula (3), calculates the room temperature (institute said here of the test body
Call " room temperature ", refer to atmosphere temperature when moulding) process of compressive strength σ c (θ, t) [MPa]；
The normal temperature compressed prediction of strength process of mold, be using the self-hardening property sand, the molding conditions parameter it
The normal temperature compressed intensity σ ca (θ, t) of mold when lower moulding mold, using the normal temperature compressed intensitometer by the test body
The normal temperature compressed intensity σ c (θ, t) for calculating the calculated test body of process, predicts the normal temperature compressed intensity σ of the mold in advance
The process of ca (θ, t)；
The normal temperature compressed intensity abstraction process of mold, be it is pre- first pass through experiment, from the room temperature pressure of the mold of the prediction
Among contracting intensity σ ca (θ, t), extract the mold will not damage and can moulding, and be capable of the normal temperature compressed intensity σ of draft
The process of ce (θ, t),
It in the actual mold of moulding, is constituted using following, that is, in the normal temperature compressed intensity by satisfaction by the mold
Abstraction process extract the normal temperature compressed intensity σ ce (θ, t), as the molding conditions parameter the time t1 it
Afterwards, draft is carried out.
[formula 4]
Δ C (θ, ti)=Δ Csat·{1-exp(-kditi)}…(1)
Here,
ΔCsat: the saturated reaction amount [wt%] of binder
kdi(i=1,2): the rate constant [1/min] of binder
[formula 5]
kdi=Aiexp(αiθ)…(2)
Here,
Ai(i=1,2), αi(i=1,2): the parameter of the binder type used is depended on
[formula 6]
σc(θ, t)={ tanh (β Δ C (θ, t1))+γ+{ tanh (ε (θ) Δ C (θ, t2)-η)}…(3)
Here,
β, γ, η: material parameter, ε: the constant determined by temperature θ
Here, using self-hardening property sand as molding material.Self-hardening property sand by sand, binder and hardening accelerator (also referred to as
Curing agent) it constitutes.
As sand, being able to use its shape is polygon or spherical, and granularity is AFS130 fresh sand below or reclaimed sand.
As binder, it is able to use the furane resins of the acid-curable containing furfuryl alcohol.In addition to this, also it is able to use alkali
The resin of property phenolic aldehyde system.Hereinafter, being illustrated centered on furane resins as binder.
As hardening accelerator, xylene monosulfonic acid system curing agent and sulfuric acid system curing agent can be used alone or as a mixture.Make
For hardening accelerator, as long as selection is suitable as the hardening of resin promotor of binder.Hereinafter, promoting as hardening
It is illustrated centered on the case where agent, hardening accelerator to be mixed with the different xylene monosulfonic acid system of concentration.
For example, it is desirable to which resin and curing agent are respectively 0.8wt%, 0.32wt% relative to the additive amount of sand.
Firstly, below in casting mold method of the invention as technical idea basis " furane resins it is anti-
Answer " and " the normal temperature compressed intensity of the self-hardening property sand after hardening " be illustrated.
(reactions of furane resins)
When constituting the dehydration condensations of the furane resins of above-mentioned self-hardening property sand and being assumed to first order reaction, following formula (4) is set up.
[formula 7]
Here, C0It is the initial concentration [wt%] of furane resins, Ct is the sand and binder and hardening as self-hardening property sand
Unreacted resin concentration [wt%] of promotor after from mixing at the time of a certain process time t [min], kd is tree
The rate constant [1/min] of rouge.In addition, being from after the mixing to before draft (that is, hardening by time t
With the presence of prototype among self-hardening property sand afterwards.Alternatively, when aftermentioned test body is in mold) time t1 [min], and from draft
Later (that is, among self-hardening property sand after hardening at the time of no longer there is prototype.Alternatively, aftermentioned test body is fetched into outside mold
At the time of) to the self-hardening property sand after hardening in the state of being placed in atmosphere elapsed time (alternatively, by for place
Aftermentioned test body in an atmosphere carries out the time before compression test) t2 [min] when, it is believed that the reaction speed of resin is different.
In the case of (that is, when ti=t1, t2) any one of above-mentioned time t1 and time t2 as molding conditions parameter,
It all assumes that as first order reaction, by above formula (4) such as following formula (5) in this way, the case where corresponding respective time t1 and time t2 changes
It writes.
[formula 8]
Kdi among above-mentioned formula (5), the resin of (that is, the case where ti=t1, t2) when being above-mentioned time t1 and time t2
Rate constant [1/min].
The reacting dose calculation process > of < binder (resin)
In addition, passing through respectively in the temperature θ [DEG C] of the above-mentioned sand before the mixing as molding conditions parameter if set
The reacting dose of resin under at the time of ti=t1, t2 [min] is Δ C (θ, ti) [wt%], then is capable of the mode pair of following formula (6)
Above formula (5) deformation is rewritten.
[formula 9]
Here, fi (θ) indicates the function of the temperature θ of sand.In addition, the reaction of resin, if no matter considering the temperature θ of sand,
The mode of above formula (6) following formula (1) can will then be rewritten with the process of time ti and close to 100%.
[formula 10]
Δ C (θ, ti)=Δ Csat·{1-exp(-kditi)}…(1)
Here,
ΔCsat: the saturated reaction amount [wt%] of binder
kdi(i=1,2): the rate constant [1/min] of binder
Additionally, it is believed that the reaction speed of resin changes with the temperature θ of sand.I.e., it is believed that temperature is higher, and the reaction of resin is got over
Fastly.Therefore, it is necessary to consider the temperature dependency of the rate constant kdi of resin.It, can be by following formula about the temperature dependency
(7) performance of Arrhenius formula shown in.
[formula 11]
Here, Ai (i=1,2) is occurrence factor, Δ E is activation energy [J/mol], and R is gas constant [J/ (molK)].
To put it more simply, the mode of above formula (7) following formula (2) is rewritten.
[formula 12]
kdi=Aiexp(αiθ)…(2)
Here,
Ai(i=1,2), αi(i=1,2): the parameter of the binder type used is depended on
Here, the mode of α i following formula (8) defines.
[formula 13]
In addition, above-mentioned Ai, α i can be acquired according to the weight measurement of aftermentioned test body test etc..
In addition, the temperature θ of sand is preferably 5~30 DEG C.If the temperature θ of sand is lower than 5 DEG C, sand does not solidify, it is difficult to keep casting
Test temperature is set as 20~50 minutes in the later-described embodiments by the shape of mould, even if sand did not had yet by 50 minutes
Solidification.On the other hand, if the temperature θ of sand is higher than 30 DEG C, the reaction of binder and hardening accelerator is promoted, and sand solidifies
Fastly, thus pot life is caused extremely to shorten, also there is the case where less than 1 minute.
(the normal temperature compressed intensity of the self-hardening property sand after hardening)
The normal temperature compressed Strength co-mputation process > of the aftermentioned test body of <
The normal temperature compressed intensity σ c (θ, ti) [MPa] of self-hardening property sand after above-mentioned hardening, it is assumed that by the dehydrating condensation of resin
Reaction determines.In addition, the reaction speed of resin generates difference in the case where above-mentioned time t1 and time t2.Therefore, if considering
The normal temperature compressed intensity σ c (θ, t) of the difference of the reaction speed of the resin, the self-hardening property sand after hardening can be by following formula (9) table
Show.
[formula 14]
σc(θ, t)=σc(Δ C (θ, t1))+σc(Δ C (θ, t2))…(9)
The right first item of above-mentioned formula (9), (that is, there is original among self-hardening property sand after hardening during being time t1 [min]
During type, alternatively, during aftermentioned test body is in mold) because of the room temperature pressure for reacting progress bring self-hardening property sand of resin
The ascending amount of contracting intensity.In addition, the right Section 2 of above-mentioned formula (9), (that is, by draft, from original during being time t2 [min]
Among the self-hardening property sand of type after curing no longer in the presence of to hardening after self-hardening property sand place in an atmosphere during, alternatively,
To for placing before aftermentioned test body in an atmosphere carries out compression test at the time of being fetched into outside mold from aftermentioned test body
During) because resin reaction progress bring self-hardening property sand normal temperature compressed intensity ascending amount.
By aftermentioned " result of the normal temperature compressed test of aftermentioned test body when changing the reacting dose of resin ", it is known that energy
Hyperbolic functions as enough following formulas (10) make the right first item of above formula (9) be allowed to approximate.
[formula 15]
σc(Δ C (θ, t1))=tanh (β Δ C (θ, t1))+γ…(10)
Here, β, γ are material parameter (constants).In addition, can according to the result for carrying out above-mentioned same normal temperature compressed test
Know, the right Section 2 of above formula (9), is able to use hyperbolic functions as following formula (11) and is allowed to approximate.
[formula 16]
σc(Δ C (θ, t2))=tanh (ε (θ) Δ C (θ, t2)-η)…(11)
Here, η is material parameter (constant).In addition, knowing that ε is the constant to change with the temperature θ mono- of sand, by following formula
(12) it indicates.
[formula 17]
ε (θ)=a θ+b ... (12)
Here, a and b are constants.
The reacting dose Δ C (θ, t1) [wt%] and Δ C (θ, t2) for the resin that will be acquired based on above-mentioned formula (1) and formula (2)
[wt%] substitutes into following formula (3), can be in the hope of the normal temperature compressed intensity σ c (θ, t) of aftermentioned test body (the self-hardening property sand after hardening)
[MPa]。
[formula 18]
σc(θ, t)={ tanh (β Δ C (θ, t1))+γ+{ tanh (ε (θ) Δ C (θ, t2)-η)}…(3)
Here,
β, γ, η: material parameter, ε: the constant determined by temperature θ
The normal temperature compressed prediction of strength process > of < mold
It is different from above-mentioned test body, also with the normal temperature compressed prediction of strength process of mold, that is, using it is above-mentioned it is same from
Rigid sand, the normal temperature compressed intensity σ ca (θ, t) of the mold under above-mentioned same molding conditions parameter when moulding mold, is answered
With the normal temperature compressed intensity σ c (θ, t) of the normal temperature compressed calculated test body of Strength co-mputation process by above-mentioned test body, in advance
Predict the normal temperature compressed intensity σ ca (θ, t) of the mold.Thus, it is possible to predict under various molding conditions parameters
The normal temperature compressed intensity σ ca (θ, t) of the mold of moulding.
The normal temperature compressed intensity abstraction process > of < mold
Also with the normal temperature compressed intensity abstraction process of mold, that is, experiment is first passed through in advance, from the normal of the mold of above-mentioned prediction
Among warm compressive strength σ ca (θ, t), extract mold will not damage and can moulding, and be capable of the normal temperature compressed intensity σ of draft
The process of ce (θ, t).As a result, under various molding conditions parameters carry out moulding mold among, in advance just it is found that
If meeting the normal temperature compressed intensity of the mold of which range, the purpose of invention can be reached.
Therefore, when the actual mold of moulding, constituted using following, by satisfaction by the normal temperature compressed of above-mentioned mold
Intensity abstraction process extract normal temperature compressed intensity σ ce (θ, t), as the molding conditions parameter the time t1 it
Afterwards, draft is carried out.
(embodiment 1)
Fig. 1 is the mold for mold test body, and (a) is top view, is (b) main view.Use such mould shown in Fig. 1
Tool, mold test body measure the weight change of the test body, thus carry out the reactivity of the resin of evaluation composition self-hardening property sand
Test.In addition, the weight change of test body, it is assumed that be to be all based on the dehydration condensation of resin, and calculate the anti-of resin
It should rate.
In Fig. 1,1 is casting moulding mold made of iron, and 2 be the combination die A for constituting moulding mold 1, and 3 are and constitute moulding
With the combination die A (2) of mold 1 opposed combination die B, 2a, 3a be respectively arranged on combination die A (2), combination die B (3) for infusing
Enter the half-open oral area of funnel-form of self-hardening property sand, 2b, 3b be respectively arranged on combination die A (2), combination die B (3) for moulding cylinder
The blank part of the semi-cylindrical of the test body of shape, 2c are for by bolt fastening combination die A (2) (not shown) and combination die B
(3) the through hole set on combination die A (2), 3c be inserted into through hole 2c bolt be screwed into be set to combination die B (3) it is interior
Threaded portion.
For the self-hardening property sand of mold test body, No. 5 silica sands of regeneration are used as sand, use furane resins as binder
(カ オ ー ラ イ ト ナ ー EF5302), it is used as hardening accelerator and is mixed with the hard of the different xylene monosulfonic acid system of concentration
Change promotor (カ オ ー ラ イ ト ナ ー TK-1 and C-21) made of substance.
In addition, above-mentioned furane resins add 0.8wt%, the blended liquid phase of above-mentioned hardening accelerator relative to above-mentioned reclaimed sand
0.32wt% is added for above-mentioned reclaimed sand.
Using Universal stirring machine, above-mentioned hardening is added in the above-mentioned reclaimed sand of the temperature as defined in heating/being cooled to and promotes
The mixed liquor of agent is kneaded 45sec, then adds furane resins and be kneaded 45sec, prepares self-hardening property sand and (is referred to as furan no-bake
Sand).
The furan no-bake sand that will prepare in the above described manner, puts into after mixing by the funnel-form of cast iron molding jig 1
In the funnel mouth that half-open oral area 2a, 3a are constituted, in the columned blank part being made of blank part 2b, 3b of semi-cylindrical,
It is shaped toTest body.
In this test, it is considered as influencing the Modelling strip of the reaction speed of furane resins (hereinafter, being also only called resin)
The temperature θ [DEG C], the time t1 from after above-mentioned mixing to before draft of above-mentioned reclaimed sand before part parameter, mixing
[min], and the anti-of resin is evaluated to for the time t2 [min] before above-mentioned test body progress compression test after draft
It should rate.
Here, the definition of the draft in this test, refers to and takes out test from mold 1 after by above-mentioned time t1
Body.
In addition, in order to change the contact area of test body and atmosphere, and changing time t1 and t2 in this test.
As the molding conditions parameter in this test, changing the temperature θ of sand is 5,10,20,30 DEG C, changes time t1
For 20,35,50min, making time t2 variation is 10,25,40min, the weight change based on the test body defined by following formula (13)
Evaluate the reactivity δ of resin.These are as the result is shown in Fig. 2~Fig. 4.
[formula 19]
Here, w0It is weight (=initial test body weight) [g], w for the self-hardening property sand initially put into mold 11It is
By centainly passing through the test body weight [g] when time t [min], w from being kneaded and terminating2It is to be considered from the reaction of resin
The mixing terminated entirely has terminated the test body weight [g] after r for 24 hours.In addition, so-called pass through time t, refer to above-mentioned time t1
It additionally include the time after above-mentioned time t2 with above-mentioned time t2.
In Fig. 2~Fig. 4, horizontal axis is by time t [min], and the longitudinal axis is the reactivity δ [%] of resin.
Fig. 2 is the relationship by time t and the reactivity δ of resin indicated in draft after by t1=20min
Figure.In Fig. 2, changing the temperature θ of sand is 5,10,20,30 DEG C, and relative to each temperature θ, time t1 is fixed as 20min, when only making
Between t2 variation be 10,25,40min.
In Fig. 2, even if being both the draft after t1=20min, if the temperature θ of sand is different, the reaction of resin
Rate δ can also differ widely.In addition, the reactivity δ of resin is further increased respectively with the process of time t2.
Fig. 3 is the figure of the relationship by time t and the reactivity δ of resin when indicating the draft after t1=35min.
In Fig. 3, changing the temperature θ of sand is 5,30 DEG C, and relative to each temperature θ, time t1 is fixed as 35min, only changes time t2
For 10,25,40min.
In Fig. 3, even if being both the draft after t1=35min, if the temperature θ of sand is different, the reaction of resin
Rate δ also has some differences.In addition, the reactivity δ of resin can be further increased respectively with the process of time t2.
Fig. 4 is the figure of the relationship by time t and the reactivity δ of resin when indicating the draft after t1=50min.
In Fig. 4, changing the temperature θ of sand is 5,10,20,30 DEG C, and relative to each temperature θ, time t1 is fixed as 50min, when only making
Between t2 variation be 10,25,40min.
In Fig. 4, even if being both the draft after t1=50min, if the temperature θ of sand is different, the reaction of resin
Rate δ is different.In addition, the reactivity δ of resin is further increased respectively with the process of time t2.
Fig. 2~shown in Fig. 4 the results show that if molding conditions Parameters variation, the reactivity δ of resin changes.
The relationship of the temperature θ of rate constant kd1, kd2 and sand of resin based on the above results identification are shown in Fig. 5
In Fig. 6.
Fig. 5, Fig. 6 are the figures for respectively indicating the relationship of rate constant kd1, kd2 of temperature θ and resin of sand.Here,
Rate constant kd1, kd2 of so-called resin respectively refers to the rate constant of the resin of time t1, time t2.Fig. 5,
In Fig. 6, ◇ symbol is rate constant kd1, kd2 of the resin acquired according to above-mentioned experimental result, and solid line is by following formula (5)
Rate constant kd1, kd2 of the resin of prediction.
[formula 20]
In Fig. 5, from 30 DEG C of the temperature θ=5 DEG C direction of sand, the rate constant kd1 of resin is from about 0.011 [1/
Min] it drastically reduces to about 0.0005 [1/min].This be considered as due to, constitute above-mentioned self-hardening property sand sand, resin and
In the mixing of curing agent, the reaction of resin is also carried out.That is, the temperature θ of sand is higher, the carry out degree of the reaction of the resin in mixing
It is bigger, under the time t1 from after mixing to before draft, it is considered that the rate constant kd1 of resin, with sand
Temperature θ it is higher, more reduce without hesitation.
In Fig. 6, from 30 DEG C of the temperature θ=5 DEG C direction of sand, the rate constant kd2 of resin, from about 0.005 [1/
Min] slightly it is reduced to about 0.0035 [1/min].But the increase of the temperature θ relative to sand, the rate constant of resin
The reduction of kd2 is inclined to, and than the increase of the temperature θ relative to sand, the reduction tendency of the rate constant kd1 of resin is small.
In addition, according to above-mentioned experimental result, identify Ai and α i's as a result, A1=-0.004, α 1=0.045, A2=
0.005, α 2=-0.017.
Distinguish according to the above results, by using above-mentioned formula (1) and (2), can predict the resin as binder
Reacting dose Δ C (θ, ti) [wt%] (i=1,2).
(embodiment 2)
Then, using under the identical molding conditions parameter prepared for the test for evaluating the reactivity of above-mentioned resin at
TypeTest body carry out compression test.That is, when the temperature θ of sand is respectively 5,10,20,30 DEG C, relative to each
Temperature θ makes time t1, the variation of time t2, the respectively examination of the reacting dose Δ C (θ, ti) of the multiple resins horizontal as 3 of moulding
Body is tested, compression test is carried out using these test body, acquires averagely normal temperature compressed intensity σ c (θ, t) [MPa].Its experimental result point
It is not shown in Fig. 7~Figure 10.
Fig. 7 be the reacting dose Δ C (θ, t) for indicating resin and the relationship of average normal temperature compressed intensity σ c (θ, t) figure (sand
Temperature θ=5 DEG C), ◇ symbol is above-mentioned experimental result, solid line be by following formula (3) prediction average normal temperature compressed intensity σ c (θ,
t)。
[formula 21]
σc(θ, t)={ tanh (β Δ C (θ, t1))+γ+{ tanh (ε (θ) Δ C (θ, t2)-η)}…(3)
Here,
β, γ, η: material parameter, ε: the constant determined by temperature θ
Fig. 8 be the reacting dose Δ C (θ, t) for indicating resin and the relationship of average normal temperature compressed intensity σ c (θ, t) figure (sand
Temperature θ=10 DEG C), ■ symbol is above-mentioned experimental result, solid line be by above formula (3) prediction average normal temperature compressed intensity σ c (θ,
t)。
Fig. 9 be the reacting dose Δ C (θ, t) for indicating resin and the relationship of average normal temperature compressed intensity σ c (θ, t) figure (sand
Temperature θ=20 DEG C), ▲ symbol is above-mentioned experimental result, solid line be by above formula (3) prediction average normal temperature compressed intensity σ c (θ,
t)。
Figure 10 is the figure (sand of the reacting dose Δ C (θ, t) for indicating resin and the relationship of average normal temperature compressed intensity σ c (θ, t)
Temperature θ=30 DEG C), × symbol is above-mentioned experimental result, and solid line is the average normal temperature compressed intensity σ c by above formula (3) prediction
(θ,t)。
In addition, according to above-mentioned experimental result, identify β, γ, η's as material parameter (constant) as a result, β=0.25,
γ=1.0, η=4.8.
In addition, the ε indicated by following formula (12), is the constant to change with the temperature θ mono- of sand, the constant a and b on the right are
A=-0.0161, b=0.6222.
[formula 22]
ε (θ)=a θ+b ... (12)
Distinguish according to the above results, using above-mentioned formula (3), the normal temperature compressed intensity σ c of above-mentioned test body can be calculated
(θ, t), also, in the normal temperature compressed intensity σ ca (θ, t) of the mold under the same molding conditions parameter when moulding mold, if
Using the normal temperature compressed intensity σ (θ, t) of the test body of the calculating, then the normal temperature compressed intensity of the mold can be predicted in advance
σca(θ,t)。
(embodiment 3)
Next, for experiment being first passed through in advance, from the normal temperature compressed intensity σ ca of the mold of prediction by above-mentioned gimmick
Among (θ, t), extract the mold will not damage and can moulding, and be capable of the normal temperature compressed intensity σ ce (θ, t) of draft
The casting mold device of (the normal temperature compressed intensity abstraction process of mold) is shown in Figure 11.
Figure 11 is the signal main view sectional view for the composition for indicating casting mold device.In Figure 11,10 be pillar, and 11 be electricity
Machine, 12 be the fixing piece for motor 11 to be fixed on to pillar 10, and 13 be the inverter for driving motor 11, and 14 be to be connected with
The power supply of inverter, 15 be wheel disc, and 16 be the connector for motor 11 to be installed on to wheel disc 15,17 be mounted to wheel disc 15 it
On columnar wooden frame, 18 be balancing device, and 20 be to be connected to balancing device 18 and be equipped with 19 axis of scroll chuck
Bracket, 21 be the prototype with distorted shape for being equipped with the axis 22 installed on scroll chuck 19, and 23 be to be filled in be provided with
Same furan no-bake sand described in the wooden frame 17 of prototype 21 and the present embodiment 1.
(that is, making the temperature θ and the time that constitute the sand of above-mentioned furan no-bake sand 23 under above-mentioned same molding conditions parameter
T1 variation), after by the time t1, ensure to balance by balancing device 18 on one side, makes prototype 21 around its axis 22 on one side
It rotates and carries out draft, moulding mold.The normal temperature compressed intensity σ ca (θ, t) of the mold of such moulding is (that is, the casting predicted in advance
The normal temperature compressed intensity σ ca (θ, t) of mould) it is shown in Figure 12 with the relationship of the formation state of mold.
In Figure 12, when the normal temperature compressed intensity σ ca (θ, t) of the mold of moulding is lower than 0.5 [MPa], a part of mold
Or defect and crackle occur for major part, are unable to moulding.In addition, the normal temperature compressed intensity σ ca (θ, t) of the mold after moulding is higher than
It, can not be from mold draft prototype when 2.2 [MPa].In contrast, the normal temperature compressed intensity σ ca (θ, t) of the mold of moulding is 0.5
The range of [MPa]~2.2 [MPa] is (that is, normal temperature compressed intensity σ ce (θ, t) shown in the longitudinal axis on the right side of Figure 12 is 0.5 [MPa]
≤ σ ce (θ, t) [MPa]≤2.2 [MPa]) when, can carry out it is sound (damage of no mold, can moulding, and can pull out
Mould) casting mold.
As above-mentioned, experiment can be first passed through in advance by distinguishing, be extracted among the normal temperature compressed intensity σ ca (θ, t) of the mold of prediction
Damage without the mold and can moulding, and be capable of the normal temperature compressed intensity σ ce (θ, t) of draft.
Therefore, it when the actual mold of moulding, is constituted using following, that is, in the room temperature by satisfaction by the mold
Compressive strength abstraction process extract the normal temperature compressed intensity σ ce (θ, t) the molding conditions parameter as described in it is described when
Between after t1, carry out draft.As a result, in the actual mold of moulding, even if molding conditions change, without every time
Tested, can the damage without mold and carry out moulding, and being capable of draft.
It this concludes the description of embodiments of the present invention, but be only to illustrate concrete example, and be not particularly limited to the present invention,
Specific composition etc., can be suitable for being designed change.In addition, effect and effect described in the mode of the implementation of invention, but
It is to list the optimal effect and effect, the function and effect of the present invention generated by the present invention, is not limited to of the invention
Content described in embodiment.
The application is based on Japanese patent application (Patent 2016-174863) filed on September 7th, 2016, and content is herein
It is incorporated into as reference.
[industrial availability]
The present invention is in the actual mold of moulding, even if molding conditions change, without being tested every time,
But the damage without mold it can carry out moulding.
[explanation of symbol]
1 moulding mold
2 combination die A
3 combination die B
The half-open oral area of 2a, 3a funnel-form
The blank part of 2b, 3b semi-cylindrical
2c through hole
3c internal thread part
10 pillars
11 motors
12 fixing pieces
13 inverters
14 power supplys
15 wheel discs
16 connectors
17 columnar wooden frames
18 balancing devices
19 scroll chucks
20 bracing struts
21 prototypes
22 axis
23 furan no-bake sand
Claims (3)
1. a kind of casting mold method, which is characterized in that be in the frame for being provided with prototype, filling be kneaded sand, binder and
Self-hardening property sand made of hardening accelerator extracts the prototype and carries out draft after self-hardening property sand hardening, the prototype
Shape be transferred on the self-hardening property sand after the hardening, thus carry out moulding mold casting mold method, the method
With following process:
The reacting dose calculation process of binder, wherein as molding conditions ginseng when using the self-hardening property sand molding test body
Number, using the temperature θ of the sand before mixing, from after the mixing among prototype self-hardening property sand after curing not
Time t1 until at the time of presence again and at the time of no longer exist among the self-hardening property sand of prototype after curing after play
The time t2 before compression test is carried out for the test body, based on following formula (1) and formula (2) calculate the binder with
The reacting dose Δ C (θ, ti) (i=1,2) of wt% meter, the unit of the temperature θ are DEG C that the unit of described time t1, t2 are min；
The normal temperature compressed Strength co-mputation process of test body, wherein will be calculated via the reacting dose calculation process of the binder
Reacting dose Δ C (θ, t1) and Δ C (θ, t2) substitute into following formula (3), calculate the test body normal temperature compressed intensity σ c (θ,
T), the unit of the compressive strength σ c is MPa；
The normal temperature compressed prediction of strength process of mold, wherein using the self-hardening property sand under the molding conditions parameter into
The normal temperature compressed intensity σ ca (θ, t) of mold when row moulding mold, using the normal temperature compressed intensitometer by the test body
The normal temperature compressed intensity σ c (θ, t) for calculating the calculated test body of process, predicts the normal temperature compressed intensity σ of the mold in advance
ca(θ,t)；With
The normal temperature compressed intensity abstraction process of mold, wherein experiment is first passed through in advance, from the normal temperature compressed strong of the mold of the prediction
Spend σ ca (θ, t) among, extract the mold will not damage and can moulding, and be capable of draft normal temperature compressed intensity σ ce (θ,
T),
When the actual mold of moulding, in the room temperature extracted by satisfaction by the normal temperature compressed intensity abstraction process of the mold
Draft is carried out after the time t1 of the molding conditions parameter as described in of compressive strength σ ce (θ, t),
ΔC(θti)=Δ Csat·{1-exp(-kditi)} …(1)
Here, Δ Csat: the saturated reaction amount in terms of wt% of binder
kdi(i=1,2): the rate constant of the 1/min meter of binder
kdi=Aiexp(αiθ) …(2)
Here,
Ai(i=1,2), αi(i=1,2): the parameter of the binder type used is depended on
σc(θ, t)={ tanh (β Δ C (θ, t1))+γ+{ tanh (ε (θ) Δ C (θ, t2)-η)} …(3)
Here,
β, γ, η: material parameter, ε: the constant determined by temperature θ.
2. casting mold method according to claim 1, which is characterized in that the normal temperature compressed intensity σ ce in terms of MPa
(θ, t) is 0.5MPa≤σ ce (θ, t)≤2.2MPa.
3. casting mold method according to claim 1 or 2, which is characterized in that the temperature θ of the sand is 5 DEG C~30 DEG C.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-174863 | 2016-09-07 | ||
| JP2016174863A JP6619309B2 (en) | 2016-09-07 | 2016-09-07 | Mold making method |
| PCT/JP2017/031602 WO2018047737A1 (en) | 2016-09-07 | 2017-09-01 | Mold manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109689246A true CN109689246A (en) | 2019-04-26 |
| CN109689246B CN109689246B (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780054679.4A Expired - Fee Related CN109689246B (en) | 2016-09-07 | 2017-09-01 | Method for molding a mold |
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| Country | Link |
|---|---|
| US (1) | US10589345B2 (en) |
| JP (1) | JP6619309B2 (en) |
| KR (1) | KR102103255B1 (en) |
| CN (1) | CN109689246B (en) |
| DE (1) | DE112017004496B4 (en) |
| TW (1) | TWI649138B (en) |
| WO (1) | WO2018047737A1 (en) |
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| JP7314871B2 (en) * | 2020-07-09 | 2023-07-26 | 新東工業株式会社 | Strength measuring device and strength measuring method |
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|---|---|---|---|---|
| CN1654141A (en) * | 2004-02-12 | 2005-08-17 | 株式会社土芳产业 | Casting mold and method for manufacturing the same |
| CN102015152A (en) * | 2008-04-30 | 2011-04-13 | 花王株式会社 | Method for producing mold |
| CN102441640A (en) * | 2011-11-29 | 2012-05-09 | 罗明金 | Novel casting mold and molding method thereof |
| CN102802833A (en) * | 2010-03-18 | 2012-11-28 | 花王株式会社 | Binder composition for use in mold manufacturing |
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| US3978906A (en) * | 1974-01-29 | 1976-09-07 | Borden, Inc. | Process for the rapid production of foundry molds and cores and to a composition for use therein |
| JPS5152322A (en) * | 1974-11-01 | 1976-05-08 | Sumitomo Durez Co | Imonoyosunagatano seizohoho |
| JP3923749B2 (en) * | 2001-04-20 | 2007-06-06 | 日産自動車株式会社 | Mold manufacturing method |
| JP5125061B2 (en) * | 2006-03-14 | 2013-01-23 | 日立化成工業株式会社 | Resin composition for shell mold and resin coated sand |
| JP5563875B2 (en) * | 2010-04-16 | 2014-07-30 | 花王株式会社 | Kit for producing a mold composition |
| CN103237614B (en) * | 2010-12-27 | 2015-10-14 | 花王株式会社 | Making molds adhesive composition |
| DE102012020509A1 (en) * | 2012-10-19 | 2014-06-12 | Ask Chemicals Gmbh | Forming substance mixtures based on inorganic binders and process for producing molds and cores for metal casting |
| KR102117212B1 (en) * | 2012-12-28 | 2020-06-01 | 카오카부시키가이샤 | Method for producing structure for casting and structure such as mold |
| TW201504184A (en) | 2013-07-22 | 2015-02-01 | New Chien Tehang Co Ltd | Stabilizer for adding into green sand mold |
| ES2628255T3 (en) | 2013-10-19 | 2017-08-02 | Peak Deutschland Gmbh | Procedure to produce lost males or mold pieces for the production of castings. |
| JP6208093B2 (en) | 2013-12-05 | 2017-10-04 | 株式会社神戸製鋼所 | Core molding method and core molding apparatus |
| JP6483490B2 (en) | 2015-03-23 | 2019-03-13 | 学校法人北里研究所 | X-ray CT system phantom |
| JP6616239B2 (en) * | 2015-12-09 | 2019-12-04 | 株式会社神戸製鋼所 | Core molding method and core molding apparatus |
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2016
- 2016-09-07 JP JP2016174863A patent/JP6619309B2/en not_active Expired - Fee Related
-
2017
- 2017-09-01 WO PCT/JP2017/031602 patent/WO2018047737A1/en active Application Filing
- 2017-09-01 DE DE112017004496.0T patent/DE112017004496B4/en not_active Expired - Fee Related
- 2017-09-01 US US16/330,752 patent/US10589345B2/en not_active Expired - Fee Related
- 2017-09-01 KR KR1020197006621A patent/KR102103255B1/en active IP Right Grant
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654141A (en) * | 2004-02-12 | 2005-08-17 | 株式会社土芳产业 | Casting mold and method for manufacturing the same |
| CN102015152A (en) * | 2008-04-30 | 2011-04-13 | 花王株式会社 | Method for producing mold |
| CN102802833A (en) * | 2010-03-18 | 2012-11-28 | 花王株式会社 | Binder composition for use in mold manufacturing |
| CN102441640A (en) * | 2011-11-29 | 2012-05-09 | 罗明金 | Novel casting mold and molding method thereof |
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| KR102103255B1 (en) | 2020-04-22 |
| US10589345B2 (en) | 2020-03-17 |
| DE112017004496T5 (en) | 2019-06-19 |
| JP6619309B2 (en) | 2019-12-11 |
| US20190224743A1 (en) | 2019-07-25 |
| TWI649138B (en) | 2019-02-01 |
| CN109689246B (en) | 2020-08-25 |
| KR20190033617A (en) | 2019-03-29 |
| DE112017004496B4 (en) | 2020-08-06 |
| WO2018047737A1 (en) | 2018-03-15 |
| TW201822912A (en) | 2018-07-01 |
| JP2018039033A (en) | 2018-03-15 |
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